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NEW QUESTION 42
A user has attached an EBS volume to a running Linux instance as a "/dev/sdf" device.
The user is unable to see the attached device when he runs the command "df -h".
What is the possible reason for this?

• A. The volume is not in the same AZ of the instance
• B. The volume is not formatted
• C. The volume is not mounted
• D. The volume is not attached as a root device

Answer: C

Explanation:
When a user creates an EBS volume and attaches it as a device, it is required to mount the device. If the device/volume is not mounted it will not be available in the listing.

NEW QUESTION 43
You have decided that you need to change the instance type of your production instances which are running as part of an AutoScaling group. The entire architecture is deployed using CloudFormation Template. You currently have 4 instances in Production.
You cannot have any interruption in service and need to ensure 2 instances are always runningduring the update. Which of the options below listed can be used for this?

• A. AutoScalinglntegrationUpdate
• B. AutoScalingScheduledAction
• C. AutoScalingReplacingUpdate
• D. AutoScalingRollingUpdate

Answer: D

Explanation:
The AWS::AutoScaling::AutoScalingGroup resource supports an UpdatePoIicy attribute. This is used to define how an Auto Scalinggroup resource is updated when an update to the Cloud Formation stack occurs. A common approach to updating an Auto Scaling group is to perform a rolling update, which is done by specifying the AutoScalingRollingUpdate policy. This retains the same Auto Scaling group and replaces old instances with new ones, according to the parameters specified.
For more information on Autoscaling updates, please refer to the below link:
https://aws.amazon.com/premiumsupport/knowledge-center/auto-scaling-group-rolling-updates/

NEW QUESTION 44
You are a Devops Engineer for your company. Your company is using Opswork stack to rollout a collection of web instances. When the instances are launched, a configuration file need to be setup prior to the launching of the web application hosted on these instances. Which of the following steps would you carry out to ensure this requirement gets fulfilled. Choose 2 answers from the options given below

• A. Ensurethat the Opswork stack is changed to use custom cookbooks
• B. Ensurethat the Opswork stack is changed to use the AWS specific cookbooks
• C. Configurea recipe which sets the configuration file and add it to the ConfigureLifeCycle Event of the specific web layer.
• D. Configurea recipe which sets the configuration file and add it to the Deploy LifeCycleEvent of the specific web layer.

Answer: A,C

Explanation:
Explanation
This is mentioned in the AWS documentation
Configure
This event occurs on all of the stack's instances when one of the following occurs:
* An instance enters or leaves the online state.
* You associate an Elastic IP address with an instance or disassociate one from an instance.
* You attach an Elastic Load Balancing load balancer to a layer, or detach one from a layer.
For example, suppose that your stack has instances A, B, and C, and you start a new instance, D.
After D has finished running its setup recipes, AWS OpsWorks Stacks triggers the Configure event on A, B, C, and D.
If you subsequently stop A, AWS Ops Works Stacks triggers the Configure event on B, C, and D.
AWS OpsWorks Stacks responds to the Configure event by running each layer's Configure recipes, which update the instances' configuration to reflect the current set of online instances. The Configure event is therefore a good time to regenerate configuration files. For example, the HAProxy Configure recipes reconfigure the load balancer to accommodate any changes in the set of online application server instances.
You can also manually trigger the Configure event by using the Configure stack command. For more information on Opswork lifecycle events, please refer to the below URL:
* http://docs.aws.amazon.com/opsworks/latest/userguide/workingcookbook-events.htmI

NEW QUESTION 45
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